Impeller



FIG. 1 is a perspective view of an impeller according to a first embodiment of our design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a right view thereof;

FIG. 8 is a left view thereof;

FIG. 9 is a perspective view of an impeller according to a second embodiment of our design;

FIG. 10 is another perspective view thereof;

FIG. 11 is a top view thereof;

FIG. 12 is a bottom view thereof;

FIG. 13 is a front view thereof;

FIG. 14 is a rear view thereof;

FIG. 15 is a right view thereof; and,

FIG. 16 is a left view thereof.

Where included, broken lines showing environment or structure are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for an impeller, as shown and described. 